{
  "tests": [
    {
      "description": "set-merge: Merge with a nested field",
      "comment": "A merge option where the field is not at top level.\nOnly fields mentioned in the option are present in the update operation.",
      "set": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "option": {
          "fields": [
            {
              "field": [
                "h",
                "g"
              ]
            }
          ]
        },
        "jsonData": "{\"h\": {\"g\": 4, \"f\": 5}}",
        "request": {
          "database": "projects/projectID/databases/(default)",
          "writes": [
            {
              "update": {
                "name": "projects/projectID/databases/(default)/documents/C/d",
                "fields": {
                  "h": {
                    "mapValue": {
                      "fields": {
                        "g": {
                          "integerValue": "4"
                        }
                      }
                    }
                  }
                }
              },
              "updateMask": {
                "fieldPaths": [
                  "h.g"
                ]
              }
            }
          ]
        }
      }
    }
  ]
}